CN1108198A

CN1108198A - Bicycle front chain mover

Info

Publication number: CN1108198A
Application number: CN94119343A
Authority: CN
Inventors: 小觉; 西本直弘
Original assignee: Shimano Inc
Current assignee: Shimano Inc
Priority date: 1993-11-12
Filing date: 1994-11-11
Publication date: 1995-09-13
Anticipated expiration: 2014-11-11
Also published as: US5496222A; DE69423175T2; DE69423175D1; EP0653347B1; CN1053625C; US5620384A; EP0653347A1

Abstract

A front derailleur for a bicycle has a four-point link mechanism, and a control cable is attached by a screw to an end of a connecting arm fixed to one link of the four-point link mechanism. The connecting arm has an auxiliary projection. The control cable applies a torque to the link at a point of contact between the control cable and the auxiliary projection. The screw on the connecting arm is spaced from a chain guide which contacts a chain, to facilitate an operation to attach the control cable to the connecting arm.

Description

Bicycle front chain mover

The present invention relates to the connecting bridge of a kind of front chain shifter of bicycle, particularly front chain shifter and control wire.

Front chain shifter has one usually and is fixed on the fixed part on the bicycle frame and is supporting movably with respect to fixed part, and is supporting the moving part of the chain guide that has the vertical surface that a pair of and chain join.

In addition, moveable part carries out with respect to the tension shift cable that moves through of fixed part.Usually, this moveable part and fixed part couple together by the connecting rod that can swing.Control wire applies a moment by being connected with this swing arm on this connecting rod, make connecting rod swing, thereby moving part is moved.At this moment, the fixed position with connecting rod and shift cable is arranged on and will the actuating force of shift cable be transformed into effectively the position of the moment that makes connecting rod swing.Yet, particularly under the situation of the sort of front chain shifter below fixed part is positioned at moving part, carry out the appropriate position of installation exercise when its position is not limited in being installed in shift cable on the swing arm.

The purpose of this invention is to provide a kind of front chain shifter, even the sort of front chain shifter of its to be fixed part be positioned at moving part lower position, the connection location of swing arm and shift cable is also owing to be to be in the appropriate location of carrying out installation exercise, thereby, the control wire actuating force can be converted to effectively the moment of swinging swing arm.

In order to finish the object of the invention, front chain shifter device of the present invention has the fixed part that is fixed on the bicycle frame, the chain guide that contacts with above-mentioned chain for cycle chain is carried out displacement, be positioned at said fixing part top, be fixed with the moving part of above-mentioned chain guide, first and second connecting rods that between said fixing part and moving part, with respect to said fixing partial sum moving part both sides, are pivotably connected.Above-mentioned first and second connecting rods partly support above-mentioned moving part movably with respect to said fixing.And, this front chain shifter also have be fixed on the above-mentioned first connecting rod, install and fix the line mounting portion of above-mentioned control wire and on above-mentioned line mounting portion, extend to be provided with for above-mentioned control wire and above-mentioned line mounting portion spaced apart and with the contacted supplementary projection of above-mentioned control wire.

By such structure, can not only make the line mounting portion be arranged on the position of carrying out installation exercise easily, and can obtain the oscillatory forces of first connecting rod by formed supplementary projection in the position of leaving the line mounting portion, obtain very big moment thus.

Other purpose of the present invention, feature and effect are described in detail with reference to the accompanying drawings in the following embodiments.

Fig. 1 is the part sectional view of expression front chain shifter pith of the present invention;

Fig. 2 is in the part shown in the presentation graphs 1, and front chain shifter adopts the scheme drawing of different postures at this;

Fig. 3 is the planar view of part illustrated in figures 1 and 2;

Fig. 4 is the cutaway view along C-C section among Fig. 1;

Fig. 5 is the cutaway view along D-D section among Fig. 1;

Fig. 6 is near the block diagram the expression front chain shifter installation bracket of the present invention;

Fig. 7 A is the planar view of installation bracket;

Fig. 7 B is the cutaway view of the protuberance of the radial extension shown in the presentation graphs 7A;

Fig. 7 C and 7D prevent the planar view of chain releasing with outshot shown in the presentation graphs 7A;

Fig. 8 is the schematic diagram of the four-bar linkage of mobile chain guide;

Fig. 9 is the scheme drawing that is applied to the moment on the swing arm of front chain shifter of the present invention;

Figure 10 is the scheme drawing that puts on the moment on the swing arm of front chain shifter in the past;

Figure 11 is the scheme drawing of the shape that another embodiment had of swing arm;

Figure 12 is the swing arm of expression other embodiment shown in Figure 11 and the cutaway drawing of the state that front chain shifter adapts;

Figure 13 is the scheme drawing of state of adaptation of the swing arm different with Figure 12 of expression other embodiment shown in Figure 11;

Figure 14 is the cutaway view of another embodiment of expression rotary preventing mechanism of the present invention;

Figure 15 is the block diagram of another embodiment of rotary preventing mechanism shown in Figure 14;

Figure 16 is the part sectional view that another embodiment of rotary preventing mechanism shown in Figure 14 sees from the top;

Figure 17 is another embodiment of front chain shifter four-bar linkage;

Figure 18 is the planar view of state of another kind of posture of the front chain shifter of expression other embodiment shown in Figure 17;

Figure 19 is the reduced graph of connecting rod of the front chain shifter of other embodiment shown in Figure 17;

Figure 20 is the sketch that expression is applied to the moment on the swing arm of front chain shifter of other embodiment shown in Figure 17;

Figure 21 is the cutaway drawing that another embodiment of expression has the front chain shifter of line mounting portion;

Figure 22 is the scheme drawing of the another kind of state of front chain shifter of other embodiment shown in Figure 21;

Figure 23 is the block diagram of the front chain shifter line mounting portion of other embodiment shown in Figure 21;

Figure 24 is the part sectional view that additional embodiments has the front chain shifter of line mounting portion.

Structure to sprocket wheel before the present invention describes with reference to the accompanying drawings.Fig. 1～Fig. 3 is the scheme drawing of the main portion of first embodiment of the invention.

In this manual, the place ahead, rear, top, below, and all be the place ahead and other direction that defines with respect to the bicycle that has this preceding sprocket wheel laterally.Particularly the vertical extent part 1b shown in Figure 1 of bicycle frame 1 is called seat pipe 1b, the direction from sprocket wheel G1～G3 towards this pipe 1b is interior side direction, and on the contrary, the direction from seat pipe 1b towards sprocket wheel then is called lateral direction.

The part of bicycle body's framework 1 is represented by bottom bracket 1a.2 expressions be crankshaft arrangement tightening screw that usefulness is installed, then be installed on the bottom bracket 1a by this tightening screw 2 fastening installation bracket 3a.

Constituted fixed parts 3 by installation bracket 3a and by the mounting screw 4 bonded assembly support component 3b that are positioned at this installation bracket 3a upper end.Connecting the moving part that has

chain guide

7a, 7b movably by a pair of swing arm on this fixed parts 35,6.7c constituted above chain guide was reached by a pair of speed change dish 7a arranged side by side and 7b.In a pair of

swing arm

5,6 one promptly is equipped with pull back spring 8 in the base end part of swing arm 5.A leg of this pull back spring 8 is fixed on the above-mentioned support component 3b, and another leg then is fixed on the swing arm 5.Like this, this pull back spring 8 is pressed to swing arm 5 the interior side direction of bicycle.

As mentioned above, the

swing arm

5,6 of moving part 7 by relative swing with fixed parts is supported movably lives.As shown in Figure 6, pair of

links support component

3c, 3d are integrally formed with above-mentioned support component 3b by punching press.Among this a pair of link supports

parts

3c, 3d one, promptly link supports part 3c first supports the end of swing arm 5 downsides axle center 5a and supports around what extend along the car body fore-and-aft direction swingably.And the end of these swing arm 5 tops and a pair of connecting bridge 7c that has moving part 7 as shown in Figure 4, the side of 7d, promptly connecting bridge 7c is corresponding, and can relatively swingingly be hinged together around the second support axle center 5b.This second pivot shaft 5b and the parallel or almost parallel of the above-mentioned first pivot shaft 5a.

Connecting bridge 3d goes up around what extend along the car body fore-and-aft direction and the 3rd supports the lower side that axle center 6a is supporting swing arm 6 swingably, and the upper end of this fork 6 then can be around supporting the 4th of the parallel or almost parallel of axle center 6a and support that axle center 6b is relative swingingly to be hinged on the connecting bridge 7d with the above-mentioned the 3rd.

From first support axle center 5a to second of moving part 7 support the 5b of axle center distance with from the 3rd support axle center 6a to the 4th of moving part 7 support that distance the 6b of axle center equates or about equally, above-mentioned first with the interval of the 3rd

support axle center

5a and 6a with the second and the 4th support axle center 5b equates with the interval of 6b or about equally.Particularly as shown in Figure 1, the first and the 3rd support the second and the 3rd of

axle center

5a and 6a and moving part 7 support axle center 5b compare with 6b be arranged on more by under the position.That is, constitute the four-bar linkage of an almost parallel by fixed parts 3 and moving part 7 and a pair of swing arm 5,6.Fixed parts 3 is the fixing connecting rods of below one side, and moving part 7 is the movable connecting rods of top one

side.Swing arm

5,6 green phases are for the swing of fixed parts 3, moving part 7 just sprocket wheel G1～G3 is maintained necessarily with respect to the posture of chain 9 or roughly certain degree and with respect to vehicle body frame 1 along its side travel.

Like this, moving part 7 is arranged on the top of fixed parts 3, the speed change dish 7a that has on by moving part 7 at a pair of swing arm that adds on the moving part 75,6 covers.Promptly, as as indicated in Fig. 3,

swing arm

5,6, moving part by the represented part of 7zd from seeing with speed change dish 7a overlapping fully with respect to the vertical direction of speed change dish 7a, from bicycle laterally, then these parts are positioned at the position that is no more than chain guide upper surface 7c, are arranged to roughly be hidden in the form among the speed change dish 7a.Like this, by moving part 7 being arranged on the top of fixed parts 3, thereby can realize the densification of front chain shifter.

In addition, as shown in Figure 4, the length of first and

second pivot shaft

5a and 5b is shorter than the length of the 3rd and the 4th 6a and 6b.Swing arm 5 just can not produce with seat pipe 1b and interfere like this.That is, swing arm 5, is in and seat pipe position overlapped from the bicycle front for its original position.The bicycle transverse width of front chain shifter is narrowed down, thereby help the densification of front chain shifter.

Part to installation bracket 3a describes below.

By installation bracket 3a being fixed on the bottom bracket part 1a, thereby fixed parts 3 is fixed on the vehicle body frame 1, at this moment, as shown in Figure 5 and Figure 6, aforementioned support component 3b with two fork-shaped root 3e on be equipped with and be connected the clamping plate of making as the C font resin of connecting bridge on the framework 10, these clamping plate 10 are fastened on the seat tube portion 1b of vehicle body frame 1.Like this, as fastening by with seat tube portion 1b of the clamping plate 10 of connecting bridge, determine posture and spline around the bent axle axle center with respect to the vehicle body frame 1 of fixed parts 3.Thus, allow moving part 7 and sprocket wheel G1～G3 become the position relation that is adapted to speed change, and this position concern that speed change can not change come what may around the position in sprocket rotation axle center relation.

As shown in Figure 5, the face 10a that joins with the base 1b of above-mentioned clamping plate 10 has and the corresponding shape of seat pipe 1b outside face.Usually seat pipe 1b is cylindraceous, and face 10a also is cylindraceous.Offer the otch 10b that is used to embed above-mentioned root 3e with running through on the opposite side of face 10a of above-mentioned clamping plate 10.As indicated in Fig. 5, distance from the front and back inside face of this otch 10b to the line of centers Y of face of joint 10a, just the distance L 1 of the place ahead inside face from line of centers Y to otch 10b is different with distance L 2 its length from line of centers Y to otch 10b rear inside face.The prime that these clamping plate 10 are embedded with state shown in Figure 5 with respect to root 3e with the second of the embedding that turns over is up and down compared, its position with respect to the bicycle frame of fixed parts 3 has produced variation.

That is to say that the angle θ between seat pipe 1b as shown in Figure 3 and the back vent 1c is along with the kind of bicycle is different, for racing car between 66 °～69 °, on average be about 68 °, then between 63 °～66 °, on average be about 64 ° for mountain bike, both differ 4 °.Therefore, be that benchmark is when determining the mounting position of fixed parts 3 with seat pipe 1b, be specified to the same will the generation according to the difference of the bicycle kind difference with respect to the position of the chain guide 7 of preceding sprocket wheel without exception, this often makes chain guide 7 can not be positioned at desirable position.

In order to address the above problem, will set for above-mentioned distance L 1, L2 different.For example, set for respect to root 3e apart from short L1 one side before the racing car type of the above-mentioned clamping plate 10 of embedding, with the mountain of the above-mentioned clamping plate 10 of embedding before opposite L2 one side, thereby chain guide 7 is arranged on desired position according to the kind of bicycle.Therefore adopt a plurality of this clamping plate 10 that have the contact surface 10a of different curvature radius,, can both carry out correspondence according to the difference that seat is managed the diameter of 1b no matter select that.

Like this, clamping plate 10 have just constituted a rotary preventing mechanism with the present pipe upwardly extending root 3e in 1b side.

The lower end of fixed parts 3 such as Fig. 1, the bottom bracket place that extends to shown in Figure 6.Like this, fixed parts 3 is made of the screw 4 bonded assembly support component 3b of installation bracket 3a that links to each other with bottom bracket 1a and the upper end by being arranged on installation bracket 3a.Shown in Fig. 7 a and b, this installation bracket 3a has the bottom bracket face of joint 3g that joins with bottom bracket 1a.Be among this bottom bracket face of joint 3g and be provided with a plurality of protuberance 3h that form by the radial extension of through hole 3i integratedly.These protuberances 3h has the effect of forbidding between the two that relatively moves when the end face with bottom bracket 1a contacts.These protuberances 3h also has another effect in addition.The end face that is bottom bracket is designed to vertical form, but be not always vertical situation, in this case, installation bracket 3a contacts with bottom bracket 1a, bolt member 2 is screwed into, though the end face out of plumb, because the nut of bottom bracket 1a is in horizontality, along with being screwed into of bolt member 2, the initial contact part branch of above-mentioned protuberance 3h and bolt member 2 is crushed.Consequently, even the end face out of plumb of bottom bracket 1a, installation bracket 3a also can be installed on the bottom bracket with vertical in form all the time.

As shown in Figure 1, on the arm 5c that has wire joint screw 11 of above-mentioned swing arm 5 line mounting portions, be connected with interior lines 12a from the shift cable of gear lever apparatus (not shown).

At this moment, wire guider 13 is installed in from the bottom of installation bracket 3a on the downside of bottom bracket 1a stretches out guiding support section 3f as Fig. 1 and Fig. 6, by this line-oriented device 13 interior lines 12a is supported, simultaneously to swing arm 5 direction guidings.Therefore, wire guider 13 so that the mode that interior lines 12a is easy to slide support.And wire guider 13 is supported by the fixed parts 3 as same parts with swing arm 5, thereby 5 relative position is accurately determined from wire guider 13 to swing arm.

Like this, for the interior lines 12a that is connected swing arm 5, when carrying out stretched operation, because its actuating force, make

swing arm

5,6 with respect to fixed parts 3 side oscillation outside car body, moving part 7 side shifting outside car body, the speed change dish 7a that is positioned at body inner side one side among a pair of speed change dish 7a, the 7b promotes chain 9, from minor diameter sprocket wheel G1 to the sprocket wheel G2 conversion of diameter, therefrom the sprocket wheel G2 of diameter is to large diameter sprocket wheel G3 conversion.And interior lines 12a is loosened when operation, elastic recovery actuating force by pull back spring 8 makes

swing arm

5,6 swing to body inner side with respect to fixed parts 3, moving part 7 moves to body inner side, the speed change dish 7b that is arranged in the car body outside one side among a pair of speed change dish 7a, the 7b promotes conversion from large diameter sprocket G3 to diameter sprocket wheel G2 with chain 9, and therefrom diameter sprocket wheel G2 is to minor diameter sprocket wheel G1 conversion.

As shown in Figure 1, arm 5c and swing arm 5 are arranged to one.The wire joint screw 11 as the line mounting portion of the front end setting of arm 5c is positioned at the position that at an easy rate line 12a is installed on the wire joint screw 11.Be formed with supplementary projection part 5d outstanding on away from the direction of seat pipe 1b on this arm 5c, the upper surface 5f of this supplementary projection part 5d forms level and smooth crooked shape, as shown in Figure 1, guides leading section 5e up to supplementary projection part 5d with line 12a.Therefore, line 12a is in the position of the leading section 5e that is provided with at interval by the wire joint screw, by with respect to the joint of swing arm 5 and apply a moment.Like this, when pulls wire 12a handled front chain shifter, this tensile force was by being applied on the wire joint screw 11 as seeing among this embodiment, and the mode that the leading section 5e of supplementary projection part 5d is applied moment has effectively utilized moment.In addition, this attaching screw is because the steady job of line 12a away from the position of chain guide 7, thereby can be carried out at an easy rate in the position.

The order that line 12a is fixed on the front chain shifter is as described below.At first, by fixed installation carriage 3 front chain shifter is installed on the bottom bracket 1a.At this moment, at certain position place, fix this front chain shifter corresponding to preceding sprocket wheel.Then, the end of shift cable 12a is fastened on the leading section 5e of supplementary projection part 5b, stretches, the end of line 12a is fixed among the arm 5c by wire joint screw 11 along upper surface 5f.At this moment,, can resemble as shown in Figure 1, allow four-bar linkage, also can allow four-bar linkage to look far into the distance the state static line 12a that seat pipe 1b direction is swung as shown in Figure 2 with state static line towards seat pipe 1b direction swing by pull back spring 8.

As shown in Figure 1, the CP of place is positioned at from the distance L 1 of the about 39mm of seat tubular axis heart Z of vehicle body frame 1 in the middle of speed change dish 7a and the 7b, moving part 7 is a low-speed position, chain 9 hangs on the sprocket wheel G1 of minor diameter, as shown in Figure 2, and when the above-mentioned middle CP of place is positioned at apart from distance L 2 places of seat tubular axis heart Z53mm, moving part 7 is a high speed position, chain 9 hangs on the large diameter sprocket wheel G3, and when being installed on the vehicle body frame 1 like this, swing arm 5 has just constituted the selector gear of working as shown in Figure 8.

That is, when overlapping with perpendicular line H with second imaginary line that supports axle center 5b by the first support axle center 5a, swing arm 5 is defined as the vertical direction position.Swing arm 5 with respect to above-mentioned perpendicular line H to a side, i.e. outer angle of inclination B of side oscillation of car body and when being posture to the major diameter lopsidedness, moving part 7 becomes high speed position.To opposite side, i.e. one of body inner side swing is than the also big leaning angle A of above-mentioned larger diameter side leaning angle when the posture of minor diameter lopsidedness swing arm 5 with respect to above-mentioned perpendicular line H, and moving part 7 becomes low-speed position.

Promptly, from the distance of the seat tubular axis heart Z of minor diameter sprocket wheel G1 and large diameter sprocket G3 because the relation on making, be under 39mm or the 53mm situation in addition, the a pair of

set screw

14,15 be arranged on the above-mentioned swing arm 6 is as shown in Figure 1 regulated in rotation, the swing boundary with respect to the moving part 7 of swing arm 6 is regulated in 14,15 changes of this set screw, and this boundary is to contact with the contact portion 6c of

swing arm

6 and 6d by one to set.Like this, the shift motion end of moving part 7 is regulated with seat tubular axis heart Z at interval with respect to sprocket wheel, and the above-mentioned middle CP of place is positioned at outside the tubular axis heart Z39mm, moving part 7 becomes low-speed position, be positioned at outside the 53mm, moving part 7 becomes high speed position, and it is that so assembling is used.In this case, according to the distance of the seat tubular axis heart Z of distance sprocket wheel G1, G3, the leaning angle B of above-mentioned major diameter one side becomes with the leaning angle A of above-mentioned smaller diameter side and equates that perhaps the leaning angle B of larger diameter side becomes greater than the leaning angle A of above-mentioned smaller diameter side.And under the situation of the bicycle of three kinds of sprocket wheel G1～G3 that have large, medium and small diameter, general centre distance from seat tubular axis heart Z to minor diameter sprocket wheel G1 is 39mm, centre distance from seat tubular axis heart Z to large diameter sprocket G3 is 53mm, and the hunting range W(of swing arm 5 between the inclination attitude of the inclination attitude of above-mentioned larger diameter side and smaller diameter side is with reference to Fig. 8) in carry out gear shifting operation.Above-mentioned hunting range W is because its inside is provided with the position of above-mentioned perpendicular line H, the end that is positioned at hunting range W with perpendicular line H is compared, make that supporting axle center 5a from above-mentioned first of fork 5 shortens to above-mentioned second length M that supports axle center 5b, the pivot angle of swing arm 5 diminishes, and can allow moving part 7 move the shift motion of three sections necessary cross-car of speed change.And, as shown in Figure 9,, also can carry out variable speed operation even the variation of the manipulation counter-force that pull back spring 8 produces is smaller.

That is to say, when above-mentioned perpendicular line H is positioned at hunting range one end of swing arm 5, as shown in figure 10, swing arm 5 is at low-speed position, and effect has the slewing maneuver power XL that applied by pull back spring, swing arm 5 carried out swinging operation from low-speed position antagonism pull back spring actuating force YL must be arranged on the swing arm 5.When swing arm 5 swung to midway location from low-speed position with angle A, effect had the slewing maneuver power X of pull back spring 8 on the swing arm 5, and swing arm 5 is carried out move operation from middle position antagonism pull back spring 8 must actuating force Y.When swing arm 5 swung to high speed position from middle position with angle B, effect had the slewing maneuver power XT of pull back spring 8 on the swing arm 5, and swing arm 5 is carried out move operation from high speed position antagonism pull back spring 8 must actuating force YT.Suppose that slewing maneuver power XL all equates with X and XT, the angle C of midway location and the angle D of high speed position are owing to different, thereby actuating force Y is bigger than YL, and actuating force YT is bigger than Y.Therefore, in fact along with the swing of swing arm 5, the elastic deformation amount of pull back spring 8 is changing, thereby X is bigger than XL for slewing maneuver power, and slewing maneuver power XT is bigger than X.Therefore slewing maneuver power Y is bigger than YL, and actuating force YT is bigger than Y.Particularly the difference of the actuating force YL at the actuating force YT at high speed position place and low-speed position place is very big.

To this, be positioned at perpendicular line H under the situation of hunting range of swing arm 5, as shown in Figure 9, swing arm 5 is in low-speed position, effect has the slewing maneuver power PL of pull back spring 8 on the swing arm 5, and swing arm 5 is handled to move from low-speed position opposing pull back spring 8 must actuating force FL.Swing arm 5 is at the leaning angle A of a larger diameter side of high speed one side oscillation, and when being positioned at the midway location of vertical direction, effect has the slewing maneuver power P of pull back spring on the swing arm 5, and swing arm 5 is handled to move from high speed position opposing pull back spring 8 must actuating force F.Swing arm 5 is from smaller diameter side angle of inclination B of middle position swing, and when being in high speed position, effect has the slewing maneuver power PT of pull back spring 8 on the swing arm 5, and swing arm 5 is resisted carrying out move operation actuating force FT must being arranged of pull back spring 8 in high speed position.Therefore, the slewing maneuver power PT that supposes Fig. 9 high speed position equates with the slewing maneuver power XT of Figure 10 high speed position, because the position of vertical direction is different with the position of high speed position relation, thereby makes the slewing maneuver power PT of Fig. 9 high speed position little than the slewing maneuver power XT of Figure 10 high speed position.And, among Fig. 9, owing to be accompanied by the swing of swing arm 5, the elastic deformation amount of pull back spring 8 changes, and the slewing maneuver power P of midway location is bigger than the slewing maneuver power PL of low-speed position, and the slewing maneuver power PT of high speed position is bigger than the slewing maneuver power P of midway location, consider this point, and consider FL=PL/cosE, FT=PT/cosG, the setting by to the leaning angle A of the leaning angle B of larger diameter side and smaller diameter side can make the difference of actuating force FL and F and FT become very little.This point is from Fig. 9, and angle E equates that with angle A angle G equates with angle B just can understand in addition.

In the mechanism of present embodiment, support axle center 5a or the 3rd from above-mentioned first of swing arm 5 and support axle center 6a and support axle center 5b or the 4th length M that supports axle center 6b is set about 14mm for to above-mentioned second.Like this, the CP of place is positioned at apart from distance L 1 place of seat tubular axis heart Z39mm in the middle of above-mentioned, moving part 7 is in low-speed position, the CP of place is positioned at apart from distance L 2 places of seat tubular axis heart Z53mm in the middle of above-mentioned, 7 of moving parts are in high speed position, when forming like this, the leaning angle B of above-mentioned larger diameter side is about 32 degree 24 minutes, and the leaning angle A of above-mentioned smaller diameter side is about 37 degree 23 minutes.Above-mentioned length M is set at 14mm or 16mm, also can sets all lengths less than 16mm for.By setting for below the 16mm, just can reduce actuating force by bar than relation effectively.Therefore, in this case, move the relation of necessary stroke by the leaning angle B of certain above-mentioned larger diameter side of angle initialization and the leaning angle A of smaller diameter side according to above-mentioned length M and moving part 7 speed changes.

As shown in Figure 6 and Figure 7, installation bracket 3a goes up and is wholely set projection 40 outshots 43 that prevent that chain releasing from using, the structure before chain 9 formations do not fall between the installation bracket 3a of the minimum diameter sprocket wheel G1 of sprocket wheel and fixed parts 3.

That is, be appreciated that from Fig. 6 and Fig. 7 that the part of installation bracket 3a upper end sprocket wheel rotation driving direction the place ahead one side is protruded to minimum diameter sprocket wheel G1 one side.As shown in Figure 7, this projection 40 be arranged on than the tooth top of the middle diameter sprocket wheel G2 of preceding sprocket wheel will by under the position, its upper surface 40a forms towards the dip plane of the direction of minimum diameter sprocket wheel G1.Thereby, 7b moves manipulation with the speed change dish, chain 9 therefrom diameter sprocket wheel G2 when minimum diameter sprocket wheel G1 conversion, suppose that chain 9 that diameter sprocket wheel G2 therefrom deviates from exceeds the sprocket wheel G1 of minimum diameter because of error, fall between this sprocket wheel G1 and the installation bracket 3a, chain 9 also can lean on above-mentioned projection 40, is transformed on the sprocket wheel G1 of minimum diameter by upper surface 40a guiding thereafter.As Fig. 7 D

Shown in, for the place ahead one side that the sprocket wheel of this projection 40 rotates driving direction, the end of bonded assembly installation bracket 3a is provided with the outshot 43 integrally formed with this installation bracket 3a to minimum diameter sprocket wheel one lateral bending song on the above-mentioned projection 40.Like this, this outshot 43 also is arranged on the position roughly the same with above-mentioned projection 40, and forms towards the place ahead one side radius of curvature of sprocket wheel rotation driving direction and diminish gradually, near the form of the axle center X of bottom bracket 1a.Like this, chain 9 is when hanging the state join and reverse by sprocket wheel G1 with minimum diameter sprocket wheel G1, the chain 9 that reasons such as chain 9 tension force deficiencies cause is deviate from towards the below of sprocket wheel G1, appearance is allowed chain 9 deviate from gradually by counter-rotating, finally make the problem that drops between minor diameter sprocket wheel G1 and the installation bracket 3d, in this case, shown in Fig. 7 D, contacting on chain and this outshot 43 stoped this coming off.So, when sprocket wheel G1 is just changeing subsequently, because the effect of above-mentioned outshot 40 upper surface 40a can make chain 9 hang once more and fit on the minimum diameter sprocket wheel G1.

The additional embodiments of swing arm 5 has been shown among Figure 11, this swing arm 5 is different with original embodiment, it is around the formed through hole of swing fulcrum 5a from the part of the fixing wire joint screw 11 of shift cable 12a to this connecting rod 5 and forms the above extendible portion 5d of 180 degree, and the groove 5g for line 12a embedding is set on the side face of this extendible portion 5d.

Like this, as shown in figure 12, for using the situation of drawing the formula structure downwards under the what is called that line 12a is stretched out, effect by pull back spring 8 allows

speed change dish

7a and 7b put the state of minor diameter sprocket wheel G1 one side, identical with original embodiment, with respect to the contact point P2 of the line 12a of swing arm 5 in the pendulum fulcrum 5a of swing arm 5 and the position between the speed change dish 7a, for this situation, because line mounting screw 11 is in the position away from

speed change dish

7a and 7b, thereby can carry out the fixed operation of line W at an easy rate in the easy-to-operate place.

And as shown in figure 13, it also can use for the situation of the so-called top-guiding type structure that line 12a is stretched out upward, in this case, the contact point P2 of line W then be positioned at swing fulcrum 5a be the center with the rightabout side position of speed change dish 7a, equally also can carry out the fixed operation of line 12a at an easy rate.

Thereby, under the situation that adopts swing arm 5 as shown in figure 11, preceding derailleur can intactly use down respectively draw or on draw, the commonality by structure obtains low cost, can allow the user use easily simultaneously.

What represent from Figure 14 to Figure 16 is the rotary preventing mechanism additional embodiments.In this embodiment, on the part of bottom bracket 1a end face, be provided with breach 101.In addition, the installation bracket 3a of fixed parts 3 is provided with the projection 102 that its part is formed to bottom bracket 1a one lateral buckling, by mounting hole 100c the contact component 100 that synthetic resin is made can be installed with freely shifting one's position on this projection 102, this contact component 100 is positioned at above-mentioned breach 101.Like this, the front and rear surfaces of above-mentioned contact component 100 constitute by above-mentioned breach 101 form with respect to the contact surface 100a, the 100b that are touched face, simultaneously as shown in figure 16, to the distance L 1 of a side contacts face 100a and in contrast with the previous embodiment to the distance L 2 of opposite side contact surface 100b from the center of above-mentioned hole 100c, L1 one side will be grown from the center of mounting hole 100c.

Thereby for this additional embodiments, when on projection 102 is installed, contact component 100 being installed by mounting hole 100c, contact surface 100a installs with prime forward, during turned upside down, contact surface 100b installs with second forward, thereby from installation bracket 3a, can be touched face on the position of the contact surface that contacts to the change of car body fore-and-aft direction, can to manage the variation of the angle θ between 1b and the back vent 1c corresponding with seat.Like this, according to described additional embodiments, the contact component 100 that has two

contact surface

100a, 100b and mounting hole 100c constitutes the regulating mechanism 104 that the position of contact surface is changed to the car body fore-and-aft direction with respect to installation bracket 3a with projection 102, and this regulating mechanism 104 is arranged between installation bracket 3a and contact surface 100a, the 100b.

And according to this additional embodiments, the installation bracket 3a of fixed parts 3 itself contacts with the car body of bicycle, and support component 3b then is in state fully freely.

According to arriving these described whole embodiment, allow

contact portion

10 or 100 contact with the seat pipe 1b of vehicle body frame, determine the posture of installation bracket 3a by allowing

contact surface

10a, 100a, 100b contact with the face that is touched of bottom bracket 1a, except this structure, can also adopt and following pipe 1d, the contacted structure of back vent 1c.

Regulating mechanism is except allowing

contact portion

10 or 100 modes with change of direction change the structure of position of contact surface, for example also can adopt screw rod or analogue to change the position of contact surface, can also adopt the position that changes contact surface by insertion dividing plate between contact portion and root 3e or the like various structures.

For fixed parts, do not need to resemble shown in the embodiment must separate support component 3b and installation bracket 3a, also can allow installing component integral body integrally formed from the tabular body.

Below derailleur shown in Figure 17 is described.

In the bar shaped fixed parts 20 that on the seat tube portion 1b of bicycle body's framework 1, installs and fixes and constitute, by a pair of

swing arm

21,22 are connecting one has pair of right and left speed change dish 23a, the chain guide 23 of 23b, simultaneously, at a pair of swing arm 21, be positioned at the pull back spring 24 that disposes on body inner side one side's the root termination of bar 21 in 22, by said fixing parts 20 are applied an oscillatory forces by the counter-force parts to swing arm 21, apply a structure for chain guide 23 and constitute, thereby constituted the third gear front chain shifter of bicycle towards the power of fixed parts 20 directions swing.

Promptly, fixed parts 20 and chain guide 23 are coupled together by swing arm 21,22, on the first connecting rod support section 20a of said fixing parts 20, root one end of swing arm 21 of making way for body inner side one side is hinged swingably around the support axle center of car body fore-and-aft direction 21a, the end that moves about of this swing arm 21 is connected from chain guide 23 bodies on the end that the extended arm 23c of body inner side stretches out, and this connection is can be relative swingingly hinged around the connection axle center of or almost parallel parallel with above-mentioned support axle center 21a 21b.Therefore on the second connecting rod support section 20b of said fixing parts 20, the first side of root end of articulated swing arm 22 between swing arm 21 and speed change dish 23a, this hinged be can be around the support axle center of car body fore-and-aft direction 22a swing, the end that moves about of this swing arm 22 is connected on root one end of above-mentioned arm 23c of chain guide 23, this connection then is can be around the relative swing of the connection axle center of or almost parallel parallel with above-mentioned support axle center 22a 22b.That is, swing arm 21 and 22 green phases are for the swing of fixed parts 20, make chain guide 23 with respect to vehicle body frame 1 along side travel.

Connecting interior lines 12a by wire joint screw 25 on the end of moving about of above-mentioned swing arm 21 from the shift cable of gear lever apparatus (not shown), when interior lines 12a is strained, its actuating force makes swing arm 21,22 with respect to fixed parts 20 side oscillation outside car body, chain guide 23 side shifting outside car body, the dish 23a that is arranged in body inner side one side among a pair of speed change dish 23a, the 23b presses chain 9 to the large diameter thruster of sprocket wheel G1～G3, from minor diameter sprocket wheel G1 to diameter sprocket wheel G2 conversion, therefrom diameter sprocket wheel G2 is to large diameter sprocket wheel G3 conversion.And when loosening interior lines 12a, by the actuating force of the elastic recovery of pull back spring 24 swing arm 21,22 is swung to body inner side with respect to fixed parts 20, chain guide 23 moves to body inner side, the dish 23b that is positioned at the car body outside one side among a pair of speed change dish 23a, the 23b presses chain 9 to a thruster of sprocket wheel G1～G3 medium-small diameter, from large diameter sprocket G3 to diameter sprocket wheel G2 conversion, therefrom diameter sprocket wheel G2 is to the sprocket wheel G1 of minor diameter conversion.

Fixed parts 20 by swing arm 21 will support axle center 21a and be configured in chain guide 23 and connect on the lower level of axle center 21b, fixed parts 20 by swing arm 22 will support axle center 22a and be configured on the higher level of the connection axle center 22b of chain guide 23, and swing arm 21 is worked as shown in Figure 19 and carried out variable speed operation.

That is, the support axle center 21a of the fixed parts 20 by swing arm 21 is a perpendicular line with the imaginary line that is connected axle center 21b towards

chain

23, and 21 of swing arms are defined on the vertical direction position.Therefore, at this moment above-mentioned imaginary line is called perpendicular line H.Swing arm 21 is with respect to above-mentioned perpendicular line H one side direction, i.e. a car body lateral direction leaning angle B of swing and when being posture to the major diameter lopsidedness, chain guide 23 becomes high speed position, and 9 on chain hangs on the large diameter sprocket G3.Swing arm 21 is with respect to above-mentioned perpendicular line H opposite side direction, be that one of body inner side direction swing is when being posture to the minor diameter lopsidedness than the also big leaning angle A of the leaning angle B of above-mentioned major diameter one side, chain guide 23 becomes low-speed position, and 9 on chain hangs on the minor diameter sprocket wheel G1.

Therefore, since from the above-mentioned support axle center 21a of swing arm 21 to the length N 1 that connects axle center 21b, from the above-mentioned support axle center 22a of swing arm 22 to the length N 2 that connects axle center 22b, the leaning angle B of the leaning angle A of minor diameter one side, major diameter one side must set corresponding value and implement, thereby the shift motion S of chain guide 23 action 14mm, then above-mentioned value is set for: about 12 degree of leaning angle B=of about 51 degree 29 minutes of the leaning angle A=of the about 16mm of N1=, the about 20mm of N2=, minor diameter one side, major diameter one side 16 minutes.

And as shown in figure 20, swing arm 21 is a low-speed position, is acting on slewing maneuver power RL by pull back spring 24 on the swing arm 21, this swing arm 21 is carried out move operation from low-speed position opposing pull back spring 24 must need actuating force QL.Swing arm 21 is swung with major diameter lopsidedness angle A to high-speed side, when being positioned at the vertical direction midway location, swing arm 21 is acting on rotary manipulation power R by pull back spring 24, swing arm 21 is carried out move operation from middle position opposing pull back spring 24 must need actuating force Q.Swing arm 21 is from the leaning angle B of a smaller diameter side of middle position swing, when being in high speed position, swing arm 21 is acting on rotary manipulation power RT by pull back spring 24, swing arm 21 is carried out move operation at high speed position opposing pull back spring 24 must need actuating force QT.Therefore,, the leaning angle A of smaller diameter side, the leaning angle B of larger diameter side are pressed above-mentioned setting, just can make above-mentioned actuating force QL, Q and QT about equally by above-mentioned length setting with

swing arm

21 and 22.

Figure 21 and Figure 22 represent is to pull out chain apparatus before having the third gear of other enforcement structure, compares with the third gear front chain shifter of Figure 1 and Figure 2, and different on the structure of the interior lines 12a that connects shift cable, other structure then is identical.

That is, be connected and fixed the swing arm 5 of in a pair of swing arm 5,6 of parts 3 and moving part 7 pull back spring 8 being installed and being connected interior lines 12a and do not adopt the swing arm 5 of Fig. 1 and Fig. 2, but installed as shown in figure 23 on draw the swing arm of handling usefulness.This swing arm 5 is made of the linkage component that has first pin-and-hole 51, second pin-and-hole 52, spring reception room 53, screw hole 54, can freely support axle center 5a around above-mentioned first by first pin-and-hole 51 swingingly is hinged on the link supports part 3c of above-mentioned support component 3, can support the connecting bridge 7c that axle center 5b is relatively swingingly connecting moving part 7 around above-mentioned second by second pin-and-hole 52, installing pull back spring 8 in the spring reception room 53, wire joint screw 11 is being installed by screw hole 54.Swing arm 5 couples together the support component 3b of moving part 7 with fixed parts 3, and moving part 7 is in the state of low-speed position, the arm 5c that has screw hole 54 supports axle center 5a with respect to first and is positioned at the opposite side of positioning disk 7a, 7b, sets out above-mentioned arm 5c, first pin-and-hole 51 and second pin-and-hole 52 thereby settle.That is, the interior lines 12a of shift cable is imported from the top along the front chain shifter of vehicle body frame 1, be fixed on the swing arm 5 by wire joint screw 11.Like this, during the 12a of stretching interior lines, supporting axle center 5a by the arm with the arm 5c side of living in of swing arm 5 around first is pulled upwardly, the residing side's of the second support axle center 5b of swing arm 5 arm and swing arm 6 are with respect to fixed parts 3 side oscillation outside car body, moving part 7 side shifting outside car body, the dish 7a that is arranged in body inner side one side among a pair of speed change dish 7a, the 7b pushes chain 9 to a sprocket wheel G1～G3 large diameter side, thereby from the sprocket wheel G1 of minor diameter to the sprocket wheel G2 conversion of diameter, therefrom the sprocket wheel G2 of diameter is to large diameter sprocket wheel G3 conversion.And when loosening interior lines 12a, because the actuating force of pull back spring 8 elastic recoverys, second arm and the swing arm 6 that supports an axle center 5b side of living in of swing arm 5 swung to body inner side with respect to fixed parts 3, moving part 7 moves to body inner side, the dish 7b that is positioned at the car body outside one side among a pair of speed change dish 7a, the 7b pushes chain 9 to a side of sprocket wheel G1～G3 medium-small diameter, thereby from large diameter sprocket wheel G3 to the sprocket wheel G2 conversion of diameter, therefrom the sprocket wheel G2 of diameter is to the sprocket wheel G1 of minor diameter conversion.

First of this swing arm 5 that upwards pull-up effect arranged supports the interval of the axle center 5a of swing arm 5 of the interval of axle center 5a and the second support axle center 5b and configuration settings one-tenth and Fig. 1 and Fig. 2 and 5b and disposes identical.Thus, the CP of place is positioned at apart from distance L 1 place of the seat tubular axis heart Z39mm of vehicle body frame 1 in the middle of speed change dish 7a and the 7b, when can part 7 being in low-speed position, chain 9 hangs on the minor diameter sprocket wheel G1, when the CP of place was positioned at distance L 2 places of distance seat tubular axis heart Z53mm in the middle of above-mentioned, when moving part 7 was in high speed position, chain 9 hung on the large diameter sprocket G3, in the time of on being installed in vehicle body frame 1 like this, having upwards, the swing arm 5 of stretching action also carries out variable speed operation as swing arm 5 actions of Fig. 1.

That is, when second imaginary line that supports axle center 5b that first of the fixed parts 3 by swing arm 5 supports axle center 5a and moving part 7 was perpendicular line, swing arm 5 was positioned at vertical direction.Thereby above-mentioned imaginary line at this moment is called perpendicular line H.Swing arm 5 is car body lateral direction swing leaning angle B with respect to above-mentioned perpendicular line H to a side, and when being the inclination attitude of major diameter one side, moving part 7 becomes high speed position.Swing arm 5 is leaning angle A also bigger than the leaning angle B angle of larger diameter side of body inner side direction swing with respect to above-mentioned perpendicular line H to opposite side, and when being the inclination attitude of minor diameter one side, moving part 7 becomes low-speed position.Therefore support axle center 5a from above-mentioned first of swing arm 5 and set about 14mm for to above-mentioned second length M that supports axle center 5b.Like this, when the CP of place is positioned at distance L 1 place of block distance tubular axis heart Z39mm in the middle of above-mentioned, moving part 7 becomes low-speed position, when the CP of place is positioned at distance L 2 places of block distance tubular axis heart Z53mm in the middle of above-mentioned, moving part 7 becomes high speed position, when assembling like this, above-mentioned larger diameter side leaning angle B is about 32 degree 24 minutes, and above-mentioned smaller diameter side inclination A is about 37 degree 23 minutes.For the swing arm 5 of pulling process on this, above-mentioned length M is set at also has 16mm except 14mm, also can set all lengths less than 16mm for.Be set in below the 16mm and can alleviate actuating force effectively than relation by bar.Therefore, in this case, according to above-mentioned length M and the relation that changes between the stroke that the speed institute of moving part 7 must move the leaning angle A of the leaning angle B of above-mentioned major diameter one side and minor diameter one side is set on certain angle.

What Figure 24 represented is the bicycle front derailleur that has the additional embodiments structure, and it is different on the structure that is connected interior lines 12a with third gear front chain shifter shown in Figure 21 with Fig. 1, and other structure then is identical.

That is, be connected and fixed in a pair of

swing arm

5,6 of parts 3 and moving part 7 pull back spring 8 is installed, and the swing arm 5 that connects interior lines 12a one side is the swing arms that have a pair of wire joint screw 11a, 11b.And when 12a direction under bottom bracket part 1a in interior lines dialled the chain device and import, by using a pair of attaching

screw

11a, 11a among the 11b, can interior lines 12a be connected on the swing arm 5 in the mode that can pull out the chain operation, when the top imports along vehicle body frame 1 from derailleur with interior lines 12a, by using a pair of attaching

screw

11a, 11b among the 11b, can interior lines 12a be connected on the swing arm 5 in the mode that can pull out chain operation, can adopt interior lines 12a is carried out drawing operation form and drawing any the operation form down with what interior 12a carried out the stretched operation speed change from the car body below of stretched operation speed change from the car body top.

Supporting the interval of axle center 5a and the second support axle center 5b and configuration relation for the swing arm 5, the first that draws, draws down dual-purpose type on this sets for and the axle center 5a of the swing arm 5 of Fig. 1 and Fig. 2 and interval and the identical form of configuration relation of 5b.Thus, when the middle CP of place of

speed change dish

7a and 7b is positioned at apart from distance L 1 place of the seat tubular axis heart Z39mm of vehicle body frame 1, moving part 7 becomes low-speed position, chain 9 hangs on the sprocket wheel G1 of minor diameter, when the CP of place is positioned at distance L 2 places of block distance tubular axis heart Z53mm in the middle of above-mentioned, moving part 7 becomes high speed position, chain 9 hangs on the large diameter chain drum G3, in the time of on being assembled in vehicle body frame 1 like this, on draw operate usefulness swing arm 5 also as swing arm shown in Figure 15 action, carry out variable speed operation.

That is, when second imaginary line that supports axle center 5b that supports axle center 5a and moving part 7 by first of the fixed parts 3 by swing arm 5 was perpendicular line, swing arm 5 was positioned at vertical direction.Thereby above-mentioned imaginary line at this moment is called perpendicular line H.Swing arm 5 is car body lateral direction swing leaning angle B with respect to above-mentioned perpendicular line H to a side, and when being the inclination attitude of major diameter one side, moving part 7 becomes high speed position.Swing arm 5 is leaning angle A also bigger than the leaning angle B angle of larger diameter side of body inner side direction swing with respect to above-mentioned perpendicular line H to opposite side, and when being the inclination attitude of minor diameter one side, moving part 7 becomes low-speed position.Therefore support axle center 5a from first of swing arm 5 and become about 14mm to above-mentioned second length setting that supports axle center 5b.Like this, when the CP of place is positioned at distance L 1 place of block distance tubular axis heart Z39mm in the middle of above-mentioned, moving part 7 becomes low-speed position, when the CP of place is positioned at distance L 2 places of block distance tubular axis heart Z53mm in the middle of above-mentioned, moving part 7 becomes high speed position, when assembling like this, above-mentioned larger diameter side leaning angle B is about 32 degree 24 minutes, and above-mentioned smaller diameter side inclination A is about 37 degree 23 minutes.For the swing arm 5 that draws and draw down dual-purpose type on described, supporting axle center 5a from above-mentioned first is to also have 16mm except 14mm to above-mentioned second length setting that supports axle center 5b, also can set all lengths less than 16mm for.Be set in below the 16mm and can alleviate actuating force effectively than relation by bar.Therefore, in this case, according to above-mentioned from above-mentioned first support axle center 5a to above-mentioned second length that supports axle center 5b and the speed that changes moving part 7 the relation the stroke that must move the leaning angle A of the leaning angle B of above-mentioned major diameter one side and minor diameter one side is set on certain angle.

As Fig. 1, Figure 21 and group chain device shown in Figure 24, when stationary links constitutes four-bar linkage below passing through, under the situation about seeing from the lateral outer side of sprocket wheel G1～G3, fixed parts 3 is hidden in moving part 7, sprocket wheel G1～G3 inboard, thereby has goodlooking advantage.The present invention also is applicable to the situation of dialling the chain device that is made of the upper fixed connecting rod.In addition, the structure on fixed parts being installed in bottom bracket part, the present invention also goes for installing and fixing the situation that strip structure on the present tube portion is dialled the chain device.

Allow the leaning angle A of minor diameter one side greater than the leaning angle B of larger diameter side, when implementing like this, can have the advantage that makes the speed change actuating force certain.Also can allow the leaning angle A of smaller diameter side less than the leaning angle B of larger diameter side, or the leaning angle B that the leaning angle A of smaller diameter side equals larger diameter side implement.

Claims

1, a kind of being installed on the bicycle frame transmitted actuating force by control wire, with cycle chain front chain shifter device of conversion between the sprocket wheel before a plurality of, comprising:

Be fixed on the fixed part on the said frame;

The chain guide that contacts with above-mentioned chain that the above-mentioned chain of conversion is used;

Be positioned at said fixing part top, be fixed with the moving part of above-mentioned chain guide;

Between said fixing part and moving part, with respect to first and second connecting rods that said fixing partial sum moving part both sides are pivotably connected, above-mentioned first and second connecting rods partly support above-mentioned moving part movably with respect to said fixing;

Be fixed on the above-mentioned first connecting rod, install and fix the line mounting portion of above-mentioned control wire, it is characterized in that it also comprises:

Extend to be provided with on the above-mentioned line mounting portion for above-mentioned control wire and above-mentioned line mounting portion spaced apart and with the contacted supplementary projection of above-mentioned control wire.

2, preceding derailleur device as claimed in claim 1, it is characterized in that: first connecting rod is installed on the fixed parts by first pivot shaft swingably, above-mentioned first connecting rod applies a thrust by the spring that has around above-mentioned first pivot shaft, in addition, above-mentioned line mounting portion has around the arm of the above-mentioned first pivot shaft circle swing and is arranged on line fix screw on the above-mentioned arm free end.

3, preceding derailleur device as claimed in claim 1 or 2, it is characterized in that: above-mentioned chain guide has first and second spigot surfaces that extend in an approximate vertical direction, the upper surface that is connected with above-mentioned first and second spigot surfaces, on the vertical direction of above-mentioned first and second spigot surfaces, above-mentioned first and second connecting rods, particularly above-mentioned line mounting portion and above-mentioned supplementary projection are arranged on and the above-mentioned first spigot surface position overlapped place.

4, preceding derailleur device as claimed in claim 1 or 2, it is characterized in that: above-mentioned chain guide has first and second spigot surfaces that extend in an approximate vertical direction, above-mentioned first spigot surface is bigger than the area of second spigot surface, on the vertical direction of above-mentioned bicycle lateral direction, the position of above-mentioned first and second connecting rods, above-mentioned line mounting portion, particularly above-mentioned supplementary projection is set at the position of being covered by first spigot surface.

5, preceding derailleur device as claimed in claim 1 or 2, it is characterized in that: above-mentioned chain guide has first and second spigot surfaces that roughly vertically extend, from the vertical direction of above-mentioned first spigot surface of the lateral direction of above-mentioned bicycle, above-mentioned first and second connecting rods, above-mentioned line mounting portion, particularly above-mentioned supplementary projection are positioned at the position that is no more than above-mentioned upper surface top.

6, as the described preceding derailleur device of one of claim 1 to 5, it is characterized in that: above-mentioned first connecting rod is installed by second pivot shaft swingably with respect to above-mentioned moving part, in above-mentioned chain guide with above-mentioned when the sprocket wheel of minimum diameter is corresponding in the sprocket wheel before a plurality of, above-mentioned first pivot shaft and the connection straight line of second pivot shaft tilt with the direction of comparing by the bicycle perpendicular line of above-mentioned first pivot shaft more to the opposite side of above-mentioned sprocket wheel, particularly with above-mentioned when the sprocket wheel of maximum gauge is corresponding in the sprocket wheel before a plurality of, being connected straight line and comparing by the bicycle perpendicular line of above-mentioned first pivot shaft more to above-mentioned sprocket wheel lopsidedness of above-mentioned first pivot shaft and second pivot shaft, the position of above-mentioned first and second pivot shafts comes to this definite.

7, as the described preceding derailleur device of one of claim 1 to 6, it is characterized in that: said fixing is partly with the installation bracket that extends to the bottom bracket that holds above-mentioned bicycle crank axle, and above-mentioned installation bracket has and the contacted bottom bracket contact surface of above-mentioned bottom bracket.

8, preceding derailleur device as claimed in claim 7 is characterized in that: above-mentioned installation bracket is provided with keeps supplying the hole that this bicycle bent axle inserts, and above-mentioned bottom bracket contact surface is provided with a plurality of projections (protuberance) by the radial extension in above-mentioned hole.

9, preceding derailleur device as claimed in claim 1, it is characterized in that: in order to stop the top of above-mentioned bottom bracket contact surface, rotation with respect to the bottom bracket of above-mentioned installation bracket, said fixing is partly with rotary preventing mechanism, above-mentioned rotary preventing mechanism is by having along the contact portion of the inside face of said frame peripheral shape and above-mentioned contact portion can being taken out, packed into, to the outstanding root of said frame direction.

10, preceding derailleur device as claimed in claim 9, it is characterized in that: the inside face semicircular in shape of above-mentioned contact portion, this semi-round midway location is according to the length center of the bicycle fore-and-aft direction of above-mentioned contact portion and displacement, above-mentioned contact portion can be installed between the prime and second with respect to above-mentioned root, and the variation by above-mentioned inside face in above-mentioned prime and the second then makes different with respect to the relative position of the framework of above-mentioned root.